BECKHOFF BK4000 - Manual (Page 22)

InterBus coupler BK4000 in InterBus S
22 BK4000
BK4500 InterBus Coupler
and fibre optic connection
Fibre optic conductor: the InterBus Club elaborated the specification of a
transmission technology based on fibre optic conductors for applications in
highly interference-prone environments and also to increase the range. For
the Beckhoff InterBus bus coupler with fibre optic connection (BK4500) use
is made of F-SMA connectors and, in this case, the length between two
stations is 1-40 m. Attention must be paid to ensuring that the slide switch
for activating and deactivating the continuing interface is set to the cor-
responding position. If the BK4500 is the last InterBus station in the ring,
the switch must be set to the OFF/END position. It must be set to the
ON/NEXT position if the BK4500 is in a position in the ring.
BK4500
RS-422 transfer in
accordance with the
Fundamental
characteristics
InterBus standard Network topology Ring with integrated return line
Medium Shielded twisted-pair cable, 3x twisted-pair with shield
Number of modules 256
between two stations 400 m
Total length 12.8 km
Data transfer rate 500 Kbits/s
Connector 9-Pin D-Sub plug connector and 9-pin D-Sub socket
Wiring for InterBus
DO, DO-N (1,6)
DI, DI-N (2,7)
(5,9)
COM (3)
Shield
PE PE
(1, 6) DO, DO-N
(3) COM
(2, 7) DI, DI-N
Incoming
Interface Outgoing
Interface
In systems with more than two modules, all modules are wired in successi-
on. The ends of the bus cable must be terminated with resistors, which are
located in each module. A jumper in the connector of the continuing inter-
face signals to the bus coupler that a further modules follows.
To be able to realise uninterrupted operation, none of the connectors must
be withdrawn and all modules in the ring must be operable.